How has this been done

I was looking at the source code for apples site and found this
http://images.apple.com/uk/global/nav/images/globalnavbg0225.png
so it seams their entire navigation bar is done with a single image file
Individual parts of the bar respond to events such as mouse overs with image swaps (as you can see from that link the bar has 4 possible states)
what i want to know is this
how can individual sections of the bar have an image swap when the only image they have is an image of the entire bar
I can think of one way but i dont know if this is what they have done or not
each section is its own DIV/ list item/ Span tag (whatever they used) and each section links to the file but offsets it with absolute positioning and overflow hidden so that only the relevant part appears? but if this is what they have done how have they made the mouseover effect work in the same way?

1) a single image file has a fixed width and height, ofen a DIV does not - this is the reason why we use DIVs not tables.
Huh? Tables have no fixed height either. But the reason has nothing to do with the going in statement. Sorry I don't get your point here.
sometimes a site will set a background to repeat. but this only works when you need the exact same colour repeated over and over. If the image is a complex one then applying it to a canvas without a fixed size wont work unless you are willing to stretch and distort the image.
<shrug> I don't understand either the content of the paragraph or what its relevance is to this discussion.
2) if your using a single image to give you all the background images you have a lot of "white" or "transparent" area, this ammount to extra data that has to be downloaded.
WHAT? We are talking about using a single image for a sprite-based rollover. That's all. And whitespace adds NOTHING to the page's weight or bandwidth.... Sorry - I'm not grasping where you are trying to go here.

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How has this been done

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